Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5782ba1c1302819…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 12:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a4f913cc9d8f1d37c90d684f6629d87 SHA-1: 06a54d2c338066371a037198365b3115ef47f8b1 SHA-256: f5782ba1c130281954de6eb4f7e88bbc5bb307ed8dedf636a743e676c909f0c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and the presence of external URIs are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://reutlinger.pl/userfiles/file/lufivaleketovojajukuri.pdf In PDF document text
    • https://pharmnet.cz/ckfiles/files/files/nasuluvoxedosepofidomolod.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/14258938236.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/88525998538.pdfIn PDF document text
    • https://alutat.com/data/file/68891261605.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/16309076116.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/wimofuliwelu.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tukarerufadikivotorala.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161350b8cac4f8---vegure.pdfIn PDF document text
    • https://globaldreamindia.com/webcms/file/31305276.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4ee9bdab---38349823305.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/wanepi.pdfIn PDF document text
    • https://luxm.pl/userfiles/file/nifenatelazimaka.pdfIn PDF document text
    • http://monthclean.com/uploads/files/202109011754322648.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/toxuwos.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mabebafalulowebam.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130a591ae065---kedumuji.pdfIn PDF document text
    • http://serting.eu/userfiles/files/8042519359.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210907005047629990.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/18594159604.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/miwuwajemo.pdfIn PDF document text
    • https://wsbtitan.com/images/file/45376602547.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/52868028553.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=sales+training+manual+examplesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6DF 17392 bytes
SHA-256: 3e5b07c7c1a5e5b1667253d64b4dded861362896d313c020fa0c74133f3e2b5e
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 10752 bytes
SHA-256: fe58b1f46f9d9f5192989d562f1fdeb9f095abc39adc23701199c7c5d1d1f660
font_02_sfnt_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1